>I seem to recall right after college before the internet was available - yes, I'm old as dirt - that the thing to do was mail as many resumes as possible to the HR directors of companies you thought you had a chance at. It seemed acceptable then. Seems like just a variation of the same thing. Albeit, a really annoying variation...
Well, they may have to revise that approach.
Also, receiving something in your personal mailbox is more personal than sending a resume by snail mail at the attention of the company.